Q1: What is the primary function of the musculoskeletal system?
A) Structural support and movement
B) Hormone regulation
C) Digestion
D) Immune defense
Answer: A
Explanation: The musculoskeletal system provides the framework for the body and enables
movement through muscles and bones.
Q2: Which organ system is mainly responsible for oxygen transport to tissues?
A) Digestive system
B) Cardiovascular system
C) Nervous system
D) Endocrine system
Answer: B
Explanation: The cardiovascular system, with the heart and blood vessels, is responsible for
circulating oxygenated blood to tissues.
Q3: Homeostasis in the human body is best described as the process of:
A) Breaking down nutrients
B) Maintaining internal stability
C) Producing hormones
D) Transmitting nerve impulses
Answer: B
Explanation: Homeostasis involves keeping the internal environment stable despite external
changes.
Q4: Which cellular component is primarily responsible for energy production?
A) Nucleus
B) Endoplasmic reticulum
C) Mitochondrion
D) Golgi apparatus
Answer: C
Explanation: Mitochondria are the “powerhouses” of the cell, generating most of the cell’s ATP.
Q5: What role do ribosomes play in the cell?
A) Lipid synthesis
B) Protein synthesis
C) DNA replication
D) Carbohydrate metabolism
Answer: B
,Explanation: Ribosomes are the sites where protein synthesis occurs through translation of
mRNA.
Q6: In the context of physiology, what does the term “metabolic regulation” refer to?
A) Control of gene expression
B) Regulation of body temperature
C) Coordination of chemical reactions in the body
D) Neural signal transmission
Answer: C
Explanation: Metabolic regulation involves controlling the chemical reactions that provide
energy and building blocks for cells.
Q7: Which body system is directly involved in the removal of carbon dioxide?
A) Respiratory system
B) Skeletal system
C) Digestive system
D) Endocrine system
Answer: A
Explanation: The respiratory system expels carbon dioxide as a waste product of metabolism.
Q8: What is the primary function of the cell membrane?
A) To generate energy
B) To regulate what enters and exits the cell
C) To store genetic information
D) To synthesize proteins
Answer: B
Explanation: The cell membrane controls the passage of substances in and out of the cell,
maintaining the cell’s internal environment.
Q9: Which process is essential for maintaining cellular homeostasis?
A) Active transport
B) Passive diffusion
C) Both active transport and passive diffusion
D) Neither active transport nor passive diffusion
Answer: C
Explanation: Both active and passive transport mechanisms help regulate the internal
environment of a cell.
Q10: The process by which a cell divides into two daughter cells is known as:
A) Mitosis
B) Meiosis
C) Apoptosis
D) Differentiation
Answer: A
Explanation: Mitosis is the process of cell division that results in two genetically identical
daughter cells.
,Q11: Which microorganism is classified as a prokaryote?
A) Fungi
B) Bacteria
C) Viruses
D) Parasites
Answer: B
Explanation: Bacteria are prokaryotic organisms, meaning they lack a true nucleus.
Q12: What is the main difference between innate and adaptive immunity?
A) Innate immunity is specific; adaptive immunity is nonspecific
B) Innate immunity is nonspecific; adaptive immunity is specific
C) Innate immunity involves antibodies; adaptive immunity does not
D) Innate immunity develops over time; adaptive immunity is present at birth
Answer: B
Explanation: Innate immunity provides a general defense, while adaptive immunity specifically
targets pathogens.
Q13: Which of the following techniques is commonly used to amplify DNA sequences?
A) Western blotting
B) Polymerase Chain Reaction (PCR)
C) Spectrophotometry
D) Chromatography
Answer: B
Explanation: PCR is a widely used method to amplify specific DNA segments.
Q14: What is the function of enzymes in biochemical reactions?
A) To slow down the reaction rate
B) To act as substrates
C) To lower the activation energy
D) To increase the temperature
Answer: C
Explanation: Enzymes act as catalysts by lowering the activation energy, thereby speeding up
chemical reactions.
Q15: In molecular biology, which process involves copying a segment of DNA into RNA?
A) Translation
B) Replication
C) Transcription
D) Transformation
Answer: C
Explanation: Transcription is the process where a segment of DNA is copied into RNA.
Q16: What is the primary function of antibodies in the immune system?
A) To kill bacteria directly
B) To identify and neutralize pathogens
C) To digest cellular debris
, D) To transport oxygen
Answer: B
Explanation: Antibodies bind to antigens on pathogens, marking them for destruction by immune
cells.
Q17: Which type of molecule are enzymes most commonly made of?
A) Carbohydrates
B) Nucleic acids
C) Proteins
D) Lipids
Answer: C
Explanation: Enzymes are proteins that facilitate and accelerate biochemical reactions.
Q18: The structure that houses genetic information in eukaryotic cells is the:
A) Mitochondrion
B) Cytoplasm
C) Nucleus
D) Lysosome
Answer: C
Explanation: The nucleus contains the cell’s genetic material in eukaryotic cells.
Q19: Which component of the immune system acts as the first line of defense against
pathogens?
A) B cells
B) T cells
C) Phagocytes
D) Antibodies
Answer: C
Explanation: Phagocytes, such as macrophages, engulf and destroy pathogens as an initial
defense.
Q20: Which biomolecule is primarily responsible for storing genetic information?
A) Protein
B) Carbohydrate
C) Nucleic acid
D) Lipid
Answer: C
Explanation: Nucleic acids, like DNA and RNA, store and transmit genetic information.
Q21: What is the primary function of the digestive system?
A) Pumping blood
B) Breaking down food and absorbing nutrients
C) Filtering waste products
D) Regulating hormones
Answer: B
Explanation: The digestive system breaks down food into nutrients that the body can absorb.